Electric Charge Physics Question help me ASAP please?

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anovak47

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A baloon rubbed against denim gains a charge of -7.0 microcoulombs. The Coulomb constant is8.98755 times ten to the ninth power. What is the electric force between the baloon and the denim when the two are separated by a distance of 6.0 cm?

I can't figure out how to find q2 because the question only seems to have q1.

Thanks!
 
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